crypto/openssl/crypto/evp/e_rc4_hmac_md5.c

   1 /* ====================================================================
   2  * Copyright (c) 2011 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    licensing@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  */
  49
  50 #include <openssl/opensslconf.h>
  51
  52 #include <stdio.h>
  53 #include <string.h>
  54
  55 #if !defined(OPENSSL_NO_RC4) && !defined(OPENSSL_NO_MD5)
  56
  57 #include <openssl/crypto.h>
  58 #include <openssl/evp.h>
  59 #include <openssl/objects.h>
  60 #include <openssl/rc4.h>
  61 #include <openssl/md5.h>
  62
  63 #ifndef EVP_CIPH_FLAG_AEAD_CIPHER
  64 #define EVP_CIPH_FLAG_AEAD_CIPHER       0x200000
  65 #define EVP_CTRL_AEAD_TLS1_AAD          0x16
  66 #define EVP_CTRL_AEAD_SET_MAC_KEY       0x17
  67 #endif
  68
  69 /* FIXME: surely this is available elsewhere? */
  70 #define EVP_RC4_KEY_SIZE                16
  71
  72 typedef struct
  73     {
  74     RC4_KEY             ks;
  75     MD5_CTX             head,tail,md;
  76     size_t              payload_length;
  77     } EVP_RC4_HMAC_MD5;
  78
  79 #define NO_PAYLOAD_LENGTH       ((size_t)-1)
  80
  81 void rc4_md5_enc (RC4_KEY *key, const void *in0, void *out,
  82                 MD5_CTX *ctx,const void *inp,size_t blocks);
  83
  84 #define data(ctx) ((EVP_RC4_HMAC_MD5 *)(ctx)->cipher_data)
  85
  86 static int rc4_hmac_md5_init_key(EVP_CIPHER_CTX *ctx,
  87                         const unsigned char *inkey,
  88                         const unsigned char *iv, int enc)
  89         {
  90         EVP_RC4_HMAC_MD5 *key = data(ctx);
  91
  92         RC4_set_key(&key->ks,EVP_CIPHER_CTX_key_length(ctx),
  93                     inkey);
  94
  95         MD5_Init(&key->head);   /* handy when benchmarking */
  96         key->tail = key->head;
  97         key->md   = key->head;
  98
  99         key->payload_length = NO_PAYLOAD_LENGTH;
 100
 101         return 1;
 102         }
 103
 104 #if     !defined(OPENSSL_NO_ASM) &&     ( \
 105         defined(__x86_64)       || defined(__x86_64__)  || \
 106         defined(_M_AMD64)       || defined(_M_X64)      || \
 107         defined(__INTEL__)              ) && \
 108         !(defined(__APPLE__) && defined(__MACH__))
 109 #define STITCHED_CALL
 110 #endif
 111
 112 #if !defined(STITCHED_CALL)
 113 #define rc4_off 0
 114 #define md5_off 0
 115 #endif
 116
 117 static int rc4_hmac_md5_cipher(EVP_CIPHER_CTX *ctx, unsigned char *out,
 118                       const unsigned char *in, size_t len)
 119         {
 120         EVP_RC4_HMAC_MD5 *key = data(ctx);
 121 #if defined(STITCHED_CALL)
 122         size_t  rc4_off = 32-1-(key->ks.x&(32-1)),      /* 32 is $MOD from rc4_md5-x86_64.pl */
 123                 md5_off = MD5_CBLOCK-key->md.num,
 124                 blocks;
 125         unsigned int l;
 126         extern unsigned int OPENSSL_ia32cap_P[];
 127 #endif
 128         size_t  plen = key->payload_length;
 129
 130         if (plen!=NO_PAYLOAD_LENGTH && len!=(plen+MD5_DIGEST_LENGTH)) return 0;
 131
 132         if (ctx->encrypt) {
 133                 if (plen==NO_PAYLOAD_LENGTH) plen = len;
 134 #if defined(STITCHED_CALL)
 135                 /* cipher has to "fall behind" */
 136                 if (rc4_off>md5_off) md5_off+=MD5_CBLOCK;
 137
 138                 if (plen>md5_off && (blocks=(plen-md5_off)/MD5_CBLOCK) &&
 139                     (OPENSSL_ia32cap_P[0]&(1<<20))==0) {
 140                         MD5_Update(&key->md,in,md5_off);
 141                         RC4(&key->ks,rc4_off,in,out);
 142
 143                         rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off,
 144                                 &key->md,in+md5_off,blocks);
 145                         blocks *= MD5_CBLOCK;
 146                         rc4_off += blocks;
 147                         md5_off += blocks;
 148                         key->md.Nh += blocks>>29;
 149                         key->md.Nl += blocks<<=3;
 150                         if (key->md.Nl<(unsigned int)blocks) key->md.Nh++;
 151                 } else {
 152                         rc4_off = 0;
 153                         md5_off = 0;
 154                 }
 155 #endif
 156                 MD5_Update(&key->md,in+md5_off,plen-md5_off);
 157
 158                 if (plen!=len) {        /* "TLS" mode of operation */
 159                         if (in!=out)
 160                                 memcpy(out+rc4_off,in+rc4_off,plen-rc4_off);
 161
 162                         /* calculate HMAC and append it to payload */
 163                         MD5_Final(out+plen,&key->md);
 164                         key->md = key->tail;
 165                         MD5_Update(&key->md,out+plen,MD5_DIGEST_LENGTH);
 166                         MD5_Final(out+plen,&key->md);
 167                         /* encrypt HMAC at once */
 168                         RC4(&key->ks,len-rc4_off,out+rc4_off,out+rc4_off);
 169                 } else {
 170                         RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
 171                 }
 172         } else {
 173                 unsigned char mac[MD5_DIGEST_LENGTH];
 174 #if defined(STITCHED_CALL)
 175                 /* digest has to "fall behind" */
 176                 if (md5_off>rc4_off)    rc4_off += 2*MD5_CBLOCK;
 177                 else                    rc4_off += MD5_CBLOCK;
 178
 179                 if (len>rc4_off && (blocks=(len-rc4_off)/MD5_CBLOCK) &&
 180                     (OPENSSL_ia32cap_P[0]&(1<<20))==0) {
 181                         RC4(&key->ks,rc4_off,in,out);
 182                         MD5_Update(&key->md,out,md5_off);
 183
 184                         rc4_md5_enc(&key->ks,in+rc4_off,out+rc4_off,
 185                                 &key->md,out+md5_off,blocks);
 186                         blocks *= MD5_CBLOCK;
 187                         rc4_off += blocks;
 188                         md5_off += blocks;
 189                         l = (key->md.Nl+(blocks<<3))&0xffffffffU;
 190                         if (l<key->md.Nl) key->md.Nh++;
 191                         key->md.Nl  = l;
 192                         key->md.Nh += blocks>>29;
 193                 } else {
 194                         md5_off=0;
 195                         rc4_off=0;
 196                 }
 197 #endif
 198                 /* decrypt HMAC at once */
 199                 RC4(&key->ks,len-rc4_off,in+rc4_off,out+rc4_off);
 200                 if (plen!=NO_PAYLOAD_LENGTH) {  /* "TLS" mode of operation */
 201                         MD5_Update(&key->md,out+md5_off,plen-md5_off);
 202
 203                         /* calculate HMAC and verify it */
 204                         MD5_Final(mac,&key->md);
 205                         key->md = key->tail;
 206                         MD5_Update(&key->md,mac,MD5_DIGEST_LENGTH);
 207                         MD5_Final(mac,&key->md);
 208
 209                         if (CRYPTO_memcmp(out + plen, mac, MD5_DIGEST_LENGTH))
 210                                 return 0;
 211                 } else {
 212                         MD5_Update(&key->md,out+md5_off,len-md5_off);
 213                 }
 214         }
 215
 216         key->payload_length = NO_PAYLOAD_LENGTH;
 217
 218         return 1;
 219         }
 220
 221 static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr)
 222         {
 223         EVP_RC4_HMAC_MD5 *key = data(ctx);
 224
 225         switch (type)
 226                 {
 227         case EVP_CTRL_AEAD_SET_MAC_KEY:
 228                 {
 229                 unsigned int  i;
 230                 unsigned char hmac_key[64];
 231
 232                 memset (hmac_key,0,sizeof(hmac_key));
 233
 234                 if (arg > (int)sizeof(hmac_key)) {
 235                         MD5_Init(&key->head);
 236                         MD5_Update(&key->head,ptr,arg);
 237                         MD5_Final(hmac_key,&key->head);
 238                 } else {
 239                         memcpy(hmac_key,ptr,arg);
 240                 }
 241
 242                 for (i=0;i<sizeof(hmac_key);i++)
 243                         hmac_key[i] ^= 0x36;            /* ipad */
 244                 MD5_Init(&key->head);
 245                 MD5_Update(&key->head,hmac_key,sizeof(hmac_key));
 246
 247                 for (i=0;i<sizeof(hmac_key);i++)
 248                         hmac_key[i] ^= 0x36^0x5c;       /* opad */
 249                 MD5_Init(&key->tail);
 250                 MD5_Update(&key->tail,hmac_key,sizeof(hmac_key));
 251
 252                 return 1;
 253                 }
 254         case EVP_CTRL_AEAD_TLS1_AAD:
 255                 {
 256                 unsigned char *p=ptr;
 257                 unsigned int   len=p[arg-2]<<8|p[arg-1];
 258
 259                 if (!ctx->encrypt)
 260                         {
 261                         len -= MD5_DIGEST_LENGTH;
 262                         p[arg-2] = len>>8;
 263                         p[arg-1] = len;
 264                         }
 265                 key->payload_length=len;
 266                 key->md = key->head;
 267                 MD5_Update(&key->md,p,arg);
 268
 269                 return MD5_DIGEST_LENGTH;
 270                 }
 271         default:
 272                 return -1;
 273                 }
 274         }
 275
 276 static EVP_CIPHER r4_hmac_md5_cipher=
 277         {
 278 #ifdef NID_rc4_hmac_md5
 279         NID_rc4_hmac_md5,
 280 #else
 281         NID_undef,
 282 #endif
 283         1,EVP_RC4_KEY_SIZE,0,
 284         EVP_CIPH_STREAM_CIPHER|EVP_CIPH_VARIABLE_LENGTH|EVP_CIPH_FLAG_AEAD_CIPHER,
 285         rc4_hmac_md5_init_key,
 286         rc4_hmac_md5_cipher,
 287         NULL,
 288         sizeof(EVP_RC4_HMAC_MD5),
 289         NULL,
 290         NULL,
 291         rc4_hmac_md5_ctrl,
 292         NULL
 293         };
 294
 295 const EVP_CIPHER *EVP_rc4_hmac_md5(void)
 296         {
 297         return(&r4_hmac_md5_cipher);
 298         }
 299 #endif